Trator of said langstaffe



(No Model.)

' J. LANGSTAFFE, Decd.

S B. LADD, Administrator. APPARATUS FOR PREVENTING STEAM BOILERINGRUSTATION.

No. 443,598. I 4 Patented 1360.30, 1890.

W11 WESSE'S [JV Vim I071? W/V w) UNITED STATES PATENT OFFICE.

JOHN LANGS'IAFFE, OF BATTERSEA, ENGLAND; STORY B. LADD ADMINIS- TRATOROF SAID LANGSTAFFE, DECEASED.

APPARATUS FOR PREVENTING STEAM-BOILER INCRUSTATION.

SPECIFICATION forming part of Letters Patent No; 443,598, dated December30, 1890.

Application filed February 10,1890. Serial No.339,838. (N0 model.)Patented in England June 1, 1888,1l'0. 8,003.

To all whom it may concern.-

Be it known that I, JOHN LANGSTAFFE, a citizen of Great Britain,residing at Battersea, in the county of Surrey, England, have inventedcertain new and useful Improvements in Apparatus for PreventingIncrnstation in Boilers, (for which I have obtained a patent in England,No. 8,003, dated June 1, 1888;) and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to electric devices forpreventing incrustation inboilers, kettles, and other vessels in which water is heated; and itconsists in the novel construction and combination of the partshereinafter fully described and claimed.

In the drawings, Figure 1 is a plan view of the device, and Fig. 2 is across-section through the same.

A is a metallic ring, and B is a disk secured to said ring. The disk 13preferably consists of a series of filaments I) passed through the ringand bent outwardly all around it in the form of a brush. The disk may,however, be formed in various ways of laminated plates, for instancetheobject being to form a very large surface charged with electricity forthe heated water to be brought in .contact with and upon which theimpurities of the water may be deposited. The filaments of the disk maybe of fibrous material and may have metallic wires Z) intermingled withthem, if desired, to assist in conducting the electricity to all partsof the disk.

0 are metallic washers secured upon each side of disk B, and D is a boltwhich passes through said washers and through ring A, and secures thefilaments of the disk in position.

The ring A and the washers O are made of metals which are adapted toform the positive and negative electrodes of an electric circuit.

For instance, the ringA may be of copper and the washers O of zinc, orthe washers C may be of copper and zinc. The small washers c, which forma partof the washers O in the drawings, are the copper portions when themain portions of the washers are of zinc.

The device is suspended in the vessel in which the water is heated andan electric current is generated by the impure water between thepositive and negative electrodes of the device. The impurities of thewater would be deposited upon the extensive surface of the disk or brushif the ring and washers were not made positive and negative electrodes;but the deposition would not be so rapid. The circular form of the diskis not material, as the device can be made of any shape found mostconvenient.

What I claim is- 1. The combination, with a positive and a negativeelectrode, of a disk of finely-divided material secured between the saidelectrodes and adapted to be suspended in the waterspace of a boiler,substantially as and for the purpose set forth.

2. The combination, with a metallic ring, of a disk secured thereto andconsisting of finely-divided filaments having metallic wiresintermingled therewith, and metallic washerplates secu red upon theopposite sides of said disk and ring, the said ring and plates beingelectrodes of opposite polarity, and the whole device being adapted tobe suspended in the water-space of a boiler, substantially as and forthe purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN LANGSTAFFE.

Witnesses:

II. D. PECKOVA,

Great Russell Sit, Bloomsbury. T. T. BARNES,

17 Gracechurch Street, London.

